Burglarproof lock



Jan- 14 1941- J. E. PANKRA-rz BURGLARPROOF LOCK Filed D60. 5, 1939 JDM ce j ff Anton/my@ Patented Jan. 14, 1941 UNITE. STATES PATENT OFFlCE 5 Claims.

This invention relates to a burglarproof lock which automatically prevents its forced operation.

The particular kind of lock to which the present invention is applied, is usually called a Yale lock which contains a cylinder which carries a bolt actuating mechanism. In this type of lock by forcibly removing` said cylinder access to the locking bolt can be obtained for the purpose of unlawful entry.

The principal object of this improvement is to provide an automatically operating means which will lock the bolt when the cylinder containing its actuating mechanism is forcibly removed, thus defeating the attempt to operate said bolt and in that way obtain an unlawful entry.

Further objects will appear from the following specific description of the parts which comprise the invention.

In the drawing:

Figure 1 is a side elevation-showing the inner wall removedof the lock and the safety device in normally operating positions.

Figure 2 is a similar view showing the cylinder removed and the safety device in locking posi tion.

Figure 3 is a horizontal sectional view on the dotted 1in@ e-a Figure 4 is a detached perspective View show ing the manner of shifting one part of the safety device when it is used for a right or left hand lock.

Figure 5 is a detached side view of the long lever of the safety device.

Figure 6 is a detached top view of Figure 5.

Figures 7 and 8 are top and side views of the short member of my safety device.

A brief reference will be first given to those parts of the lock which are well known to those skilled in the art.

Referring now to the drawing, I is a casing ci suitable shape, and it contains a transverse opening 2. Placed in this opening is a transversely extending cylinder 3 which is secured therein in any desired manner, and carries a smaller cylinder l which contains a key opening. Said cylinders carry series of tumblers-not shownwhich are actuated by a key which is also not .slflownY The cylinder il carries an arm 5 for operating the locking bolt t when. the cylinder is rotated by said key. When the cylinder 4 rotates it of course carries said arm d and in turn the arm engages the bolt ends l and moves the bolt into a locking position shown in Figure 1 or in the opposite direction for moving the bolt (Cl. 'l0-4.5)

6 within the casing to an unlocking position. The abovev operation of said parts are well known to those skilled in this art and need not therefore be further described.

Cylinder 3 is screwed in opening 9 on Figure 2 5 and a screw rod Il) is passed through the end of wall 8 with its inner end II in engagement with said cylinder. However, these two means have not been found suillcient to prevent manipulation of the controlling parts of the lock, as locks l of the character described have been unlawfully unlocked by removing the cylinder 3 therefrom which leaves an opening 9 large enough to pass a linger into the lock housing and reach the end 'I of the bolt 6 and move said bolt to the unw locked position.

To prevent the above unlawful manipulation of the parts', I provide an additional automatically acting member which acts to lock the bolt when said cylinder 3 is removed.

The above automatically lacting lock consists of two members I2 and I3, which for convenience in describing and claiming will be referred to as a primary member I2, and secondary member I3. Said primary member I2 consists of a long arm pivoted at the top and near its inner end on a pivot or Screw rod I4 which will hold the side plates of the lock and in turn is supported by a member I which depends from the upper wall I6 of said casing I. This primary member il! has at its inner end a depending arm or shoe Il which when in its normal` position is in engagement with said cylinder 3, and has its outer end provided with a supporting projection I8 which engages and supports said secondary member I3 as shown in Figure 2. The secondary member ,I3 has its inner end pivoted at i9 in the side walls of the casing I below the outer free end of the primary member I2, while its upper endis formed into a backwardly extending hook or notch 2li which engages on top of the projection I8, and below this hoole the secondary member has at its outer end a projection 2i. When the parts are in the positions shown in Figure 1 the secn ondary member is supported by the outer end of the primary member, but when the cylinder 3 is removed as shown in Fig. 2 the outer end I8 of the` primary member drops and the outer free end 2| of the secondary member drops on the bolt 6 just in rear of its locking shoulder 22, 50 and prevents said bolt from being moved inward to its unlocked position, and thereby forms an automatically acting safety device which prevents the movement of said bolt 6 to an unlocked position.

By making this safety device of two parts one a long member located next to the opening 9 and a short member located near the opposite end of the casing I, it is impossible for anyone to reach the short secondary part I3 with his finger and move it to an unlocking position. It is of course understood that three simultaneous operations are necessary, one moving the member I3 upward out of locking position with the bolt 6, two, holding it in such position, and three, moving said bolt 6 to unlocked position.

Locks are made to be used as right hand and left hand locks. This is provided for in this improvement by extending the member I5 across the wall I6 of the casing and providing said support with two slots 23 located respectively at opposite ends thereof and placing the member I2 in either slot according to whether the lock is to be used as a right or left hand lock. l

To install the cylinder 3 in the position shown in Figure 1 it is necessary that the members I2 and I3 be elevated to the positions shown in said Figure 1 of the drawing which is accomplished by providing a curved slot 24 in the upper end of the bolt 6. This slot is curved under the wall 8 and entends into the casing, and a suitable wire 25` is inserted in said slot and the inner end of the wire strikes under the projection 2I of said member I3 and said members I3 and I2 are lifted to their interlocked positions shown in Figure 1.

I desire it to be understood that changes can be made in the construction of the described parts without departing from the spirit of the invention so long as said changes come within a liberal interpretation of the appended claims.

I claim:

1. The combination with a lock comprising a housing having a movable bolt, a cylinder carrying means for controlling the movement of said bolt, of a safety device consisting of two members, one member pivoted near said cylinder and supported in a horizontal position thereby, the other member pivoted near the free end of first said member and having its free end provided with a member interlocking with the free end of the rst mentioned member and supported thereby and also provided with a locking projection held free of said bolt but when said parts are permitted to drop by the removal of said cylinder the interlocking parts separate and said locking projection engages and holds said bolt against movement.

2. A lock comprising a housing having a movable locking bolt, a cylinder located near one end of said housing, a safety device consisting of a primary member having one end pivoted near and in engagement with said cylinder, a secondary member pivoted near the free end of said primary member, said primary and secondary members having supporting engaging projections, said secondary member having also a locking projection out of engagement with said locking bolt but in locking engagement with said bolt when said cylinder support is removed.

3. A lock comprising a housing having a locking bolt at one end thereof, a cylinder near the other end, a safety device consisting of a long primary member pivoted near said cylinder and a shoe in engagement with said cylinder for holding said primary member in substantially a horizontal position, a relatively short secondary member having one end pivoted near the free end of the primary member, said secondary member provided vvith a supporting projection engaging the free end of said primary member, and the secondary member having at its free end a locking member adapted to engage said bolt and lock it when said cylinder is removed thereby releasing its support for the primary member.

4. A safety device for locks provided with a keyoperated member located in a housing and at one side thereof, said safety device consisting of an elongated primary member having one end pivoted near said key operated member and having a projection engaging said key operated member, a relatively short secondary member having its inner end pivoted below the free end of said primary member and the secondary member having an upwardly projecting member engaging said free end of the primary member, a locking bolt, said secondary member having also a locking member adapted to engage and lock the bolt when the key-operated member is removed.

5. A means for assembling the parts of a locking mechanism constructed as described, comprising a housing, a cylinder in said housing near one side thereof, a bolt at the opposite side thereof, a safety device consisting of two interlocking members arranged above said bolt, one of said interlocking members having also a locking projection adapted to engage and lock said bolt, and said bolt having a groove located under said locking projection, whereby a wire is insertible in said groove below said locking projection for moving said parts out of locking engagement with said bolt.

JESS E. PANKRATZ. 

